Parallelepiped

P: (2, 0, -1)
Q: (4, 1, 0)
R: (3, -1, 1)
S: (2, -2, 2)
T: (5, 0, 2)
U: (4, -1, 3)
V: (3, -3, 4)
W: (5, -2, 5)
q1, p, s, u, q = Polygon(P, S, U, Q)
q2, p_1, s_1, v, r = Polygon(P, S, V, R)
q3, s_2, v_1, w, u_1 = Polygon(S, V, W, U)
q4, q_1, u_2, w_1, t = Polygon(Q, U, W, T)
q5, p_2, q_2, t_1, r_1 = Polygon(P, Q, T, R)
q6, r_2, t_2, w_2, v_2 = Polygon(R, T, W, V)
a = Vector((2, 0, -1), (4, 1, 0))
b = Vector((2, 0, -1), (3, -1, 1))
c = Vector((2, 0, -1), (2, -2, 2))